US 12,146,867 B2
Rapid method for different types of biocide residual with analysis procedure
Mohamed Ahmed Saad Mahmoud, Dammam (SA); Ahmed Hamad Al-Salman, Riyadh (SA); and Hassan Yahya Al-Malki, Dammam (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Aug. 4, 2022, as Appl. No. 17/817,604.
Prior Publication US 2024/0053305 A1, Feb. 15, 2024
Int. Cl. G01N 30/24 (2006.01); C02F 1/00 (2023.01); C02F 1/50 (2023.01); G01N 30/02 (2006.01); G01N 30/14 (2006.01); G01N 30/30 (2006.01); G01N 30/68 (2006.01); G01N 30/88 (2006.01)
CPC G01N 30/24 (2013.01) [G01N 30/14 (2013.01); G01N 30/30 (2013.01); G01N 30/68 (2013.01); C02F 1/008 (2013.01); C02F 1/50 (2013.01); C02F 2209/003 (2013.01); C02F 2303/04 (2013.01); C02F 2303/20 (2013.01); G01N 2030/025 (2013.01); G01N 2030/884 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method for controlling biocide concentration in biocide treated water, the method comprising:
transporting a water stream comprising water and a biocide from an upstream location to a downstream location;
intermediate an upstream location and a downstream location, withdrawing a sample of the water stream to a sample collection and analyses system;
in the sample collection and analyses system:
preconditioning the sample, wherein preconditioning of the sample comprises heating the sample to produce a preconditioned sample;
injecting the preconditioned sample into an online gas chromatography analyzer;
measuring a concentration of the biocide in the sample via the online gas chromatography analyzer to obtain a measurement result;
transmitting the measurement result to a control system, wherein the control system calculates a biocide dosage requirement; and
either on a batch or a semi-batch basis, adjusting by the control system, automatically injecting an amount of biocide into the water stream at the upstream location based on the biocide dosage requirement; or
on a continuous basis, adjusting by the control system, automatically injecting a rate of biocide injection into the water stream at the upstream location based on the biocide dosage requirement.